ERC20 Token Standard

Definition ∞ ERC20 is a technical rulebook for creating compatible tokens on the Ethereum blockchain. This standard defines a common set of functions and events that all fungible tokens on the Ethereum network must implement, enabling interoperability with wallets, decentralized exchanges, and other smart contracts. It specifies rules for token transfer, balance checks, and approvals, ensuring consistent behavior across different tokens. The widespread adoption of ERC20 significantly contributed to the growth of the decentralized finance ecosystem.
Context ∞ Crypto news frequently mentions ERC20 tokens when reporting on new decentralized applications or token launches on Ethereum. The standard’s security implications are often discussed, particularly in relation to smart contract audits and potential vulnerabilities, which are critical for user safety. While newer standards exist, ERC20 remains a foundational element of the Ethereum ecosystem, influencing subsequent token design on other blockchains.